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Central Zone Abalone Fishery Burnell, O. et al. (2016) Central Zone Abalone Fishery Central Zone Abalone (Haliotis laevigata and H. rubra) Fishery O. Burnell, S. Mayfield, G. Ferguson and J. Carroll SARDI Publication No. F2007/000611-7 SARDI Research Report Series No. 927 SARDI Aquatic Sciences PO Box 120 Henley Beach SA 5022 October 2016 Fishery Assessment Report to PIRSA Fisheries and Aquaculture Burnell, O. et al. (2016) Central Zone Abalone Fishery Central Zone Abalone (Haliotis laevigata and H. rubra) Fishery Fishery Assessment Report to PIRSA Fisheries and Aquaculture O. Burnell, S. Mayfield, G. Ferguson and J. Carroll SARDI Publication No. F2007/000611-7 SARDI Research Report Series No. 927 October 2016 Burnell, O. et al. (2016) Central Zone Abalone Fishery This publication may be cited as: Burnell, O., Mayfield, S., Ferguson, G. and Carroll, J. (2016). Central Zone Abalone (Haliotis laevigata and H. rubra) Fishery. Fishery Assessment Report to PIRSA Fisheries and Aquaculture. South Australian Research and Development Institute (Aquatic Sciences), Adelaide. SARDI Publication No. F2007/000611-7. SARDI Research Report Series No. 927. 93pp. South Australian Research and Development Institute SARDI Aquatic Sciences 2 Hamra Avenue West Beach SA 5024 Telephone: (08) 8207 5400 Facsimile: (08) 8207 5406 http://www.pir.sa.gov.au/research DISCLAIMER The authors warrant that they have taken all reasonable care in producing this report. This report has been through the SARDI Aquatic Sciences internal review process, and has been formally approved for release by the Research Chief, Aquatic Sciences. Although all reasonable efforts have been made to ensure quality, SARDI Aquatic Sciences does not warrant that the information in this report is free from errors or omissions. SARDI Aquatic Sciences and the authors do not accept any liability for the contents of this report or for any consequences arising from its use or any reliance placed upon it. © 2016 SARDI This work is copyright. Apart from any use as permitted under the Copyright Act 1968 (Cth), no part may be reproduced by any process without prior written permission from the authors. Printed in Adelaide: October 2016 SARDI Publication No. F2007/000611-7 SARDI Research Report Series No. 927 Author(s): O. Burnell, S. Mayfield, G. Ferguson and J. Carroll Reviewer(s): M. Steer, R. McGarvey (SARDI) and Dr B. M. Steer (PIRSA) Approved by: J. Nicol Sub-Program Leader – Plant Ecology, Inland Waters & Catchment Ecology Signed: Date: 21 October 2016 Distribution: PIRSA Fisheries, Central Zone Abalone Fishery Licence Holders, SAASC Library, SARDI Waite Executive Library, Parliamentary Library, State Library and National Library Circulation: Public Domain Burnell, O. et al. (2016) Central Zone Abalone Fishery TABLE OF CONTENTS ACKNOWLEDGEMENTS ix EXECUTIVE SUMMARY 1 1. General Introduction 3 1.1. Overview ............................................................................................................. 3 1.2. History and description of the fishery .................................................................. 4 1.2.1. Commercial fishery ................................................................................... 4 1.2.2. Recreational fishery .................................................................................. 6 1.2.3. Illegal, unregulated and unreported catches ............................................. 6 1.2.4. Economic importance ................................................................................ 6 1.3. Fishery management plans ............................................................................... 11 1.3.1. Previous management plans ................................................................... 11 1.3.2. The current Management Plan ................................................................ 11 1.4. Previous Stock Assessments ............................................................................ 15 1.5. Fisheries biology of abalone ............................................................................. 16 1.5.1. Biology of greenlip in the Central Zone ................................................... 17 1.5.2. Biology of blacklip in the Central Zone .................................................... 18 2. Greenlip 19 2.1. Introduction ....................................................................................................... 19 2.2. Methods ............................................................................................................ 19 2.2.1. Fishery-dependent data .......................................................................... 19 2.2.2. Fishery independent data ........................................................................ 22 2.3. Results .............................................................................................................. 27 2.3.1. Central Zone ........................................................................................... 27 2.3.2. Spatial assessment units ........................................................................ 28 2.3.3. Risk-of-overfishing in SAUs and zonal stock status ................................ 42 2.4. Discussion ......................................................................................................... 45 3. Blacklip 51 3.1. Introduction ....................................................................................................... 51 3.2. Methods ............................................................................................................ 51 3.3. Results .............................................................................................................. 54 3.3.1. Central Zone ........................................................................................... 54 3.3.2. Spatial and temporal distribution of catch and effort ............................... 55 3.3.3. Risk-of-overfishing in SAUs and zonal stock status ................................ 59 3.4. Discussion ......................................................................................................... 62 4. General Discussion 66 4.1. Information for assessment of the CZ abalone fishery ..................................... 66 4.2. Current status of greenlip and blacklip in the CZ .............................................. 69 4.3. Harvest strategy for the CZ ............................................................................... 69 4.4. Future research needs ...................................................................................... 71 5. References 73 Appendix 1. Quality Assurance 81 A.1.1 Research planning...................................................................................... 81 A.1.2 Data collection ............................................................................................ 81 A.1.3 Data entry, validation, storage and security ............................................... 81 A.1.4 Data and statistical analyses ...................................................................... 81 A.1.5 Data interpretation and report writing ......................................................... 82 iv Burnell, O. et al. (2016) Central Zone Abalone Fishery Appendix 2. Abalone Biology 83 Appendix 3. CPUE estimates of greenlip in the Central Zone 85 Appendix 4. Catches by mapcode 88 Appendix 5. Harvest strategy PI plots 90 Appendix 6. CPUE estimation rules for BL 92 Appendix 7. Running mean CPUE estimation rules 93 LIST OF TABLES Table 1-1 Stock status terminology for the Status of Key Australian Fish Stocks Reports (reproduced from Flood et al. 2014) ............................................. 4 Table 1-2 Management milestones in the South Australian Central Zone Abalone Fishery. ....................................................................................................... 8 Table 1-3 TACC (tonnes, meat weight) for the CZ of the SAAF from 1990 to 2015. * indicates reduction in TACC associated with implementation of the marine park sanctuary zones. ................................................................................ 8 Table 1-4 Summary of the PIs and the formulae and data constraints underpinning their utilisation in the harvest strategy. ..................................................... 12 Table 1-5 Range of harvest-decision rules following identification of the risk-of- overfishing by the harvest strategy. .......................................................... 13 Table 2-1 The area (km2) of each strata from the Tiparra Reef and West Yorke Peninsula (Hardwicke Bay, Port Victoria and Corny Point) SAUs used for the estimates of harvestable biomass, including the percentage of GPS points and the number of leaded-lines surveyed within each stratum. ..... 26 Table 2-2 Outcome from application of the harvest strategy described in the Management Plan against the greenlip fishery in the CZ. Grey shading identifies the performance indicators and their respective scores. Coloured shading identifies the risk-of-overfishing category (see Figure 1-3). ND indicates no data. ..................................................................................... 44 Table 3-1 Outcome from application of the harvest strategy described in the Management Plan against the blacklip fishery in the CZ. Grey shading identifies the performance indicators and their respective scores. Coloured shading identifies the risk-of-overfishing category (see Figure 1-3). ........ 61 v Burnell, O. et al. (2016) Central Zone Abalone Fishery LIST OF FIGURES
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